Sponsors
tech•ed backstage 2010
David Connors – Codify
Jorke Odolphi – Microsoft
Ben Parker – Parker Tech
Agenda
Hello and Welcome!
Wi-Fi
IPv4 / IPv6
DemoNet & the IPv4 Legacy
Vendors and Vendon’ts and The Jiggle Test
Who’s who in the zoo?
Jack Morton Worldwide
Plus a zillion other vendors for A/V, signage, food, etc.
Jomablue
Technology Project Management & Logistics
Codify
Architecture, engineering and hard nerd questions
Jorke / Parker Tech Collaboration
DemoNet
Recent History of WiFi @ tech•ed
Year
Venue
Experience
Solution
2004
Canberra
Telstra Hotspot
2005
Gold Coast Convention and
Exhibition Centre
Telstra Hotspot
2006
Sydney Convention Centre
Excellent
8 Radios / Cisco 1232AG /
Autonomous IOS
2007
Gold Coast Convention and
Exhibition Centre
Excellent
16 Radios / Cisco 1232AG /
Autonomous IOS
2008
Sydney Convention Centre
EPIC FAIL due to
venue sabotage
16 Radios / Cisco 1232AG /
Autonomous IOS
2009
Gold Coast Convention and
Exhibition Centre
Excellent
100 Radios / Cisco 1252AGN /
Autonmous IOS
2010
Gold Coast Convention and
Exhibition Centre
Excellent – World
Class
100 Radios / Cisco 1252AGN /
Lightweight IOS + Cisco WLC
Commissioning – We’ve heard of it!
WiFi Commissioning tips:
•
How to do it
•
Never let your standards drop
•
Take responsibility for the quality of your work
become a wifi expert in 15 minutes
(apparently)
IEEE 802.3 Ethernet
IEEE 802.11 WLAN
CSMA/CD
CSMA/CA
Various physical layers and
speeds
Various physical layers and
speeds
Half or Full Duplex
Half Duplex
Uses copper wires and electricity
Uses luminiferous aether and
juju magic
Installers use expensive Fluke
testers and do their job properly
Installers talk gak at you, take all
your money and don’t do their
job properly
OMFG! Real World Tests!
Post Installation DOs
•
Run some file transfers!
•
With quiet RF and good gear you CAN get 100%
throughput ALL THE TIME – NO REALLY!!
Post Installation DON’Ts
•
Check noise-floor and produce 200 pages of BS from
AirMagnet and run
•
Use iPerf for contrived/useless results
Demonstration
Analysing RF Utilisation
Wi-Spy DBx
2006: Post Install Site Survey SCEC
2006: Post Install Real World Tests
Confirmed:
•
~2500 kilobytes per second from the Internet to a WiFi
client
•
Test done at each access point
•
Performed periodically throughout the event
2008: Same Process ... WTH?!
Yep, same commissioning procedure and testing:
•
Same RF survey and post install commissioning
•
Same physical equipment
•
Same configuration scripts
•
What happened?
2008: Symptoms
With light-medium load:
•
Everything worked fine!
•
Great performance!
With medium-heavy load (meal breaks):
•
Associations looked fine
•
Clients would get 169.254.x.x addresses
•
Clients with existing leases worked fine
DHCP
DHCPDISCOVER
Client -> Broadcast
Locate all DHCP Servers on the Network
DHCPOFFER
DHCP Server(s) -> Client
Offer a lease
DHCPREQUEST
Client -> DHCP Server
DHCPACK
DHCP Server -> Client
One ... minor ... difference
•
Technology Operation located in G01
•
Cable run too long for copper
•
Options
•
•
A) Drill into car park, run fibre = ~$5K
•
B) Traverse the Procure gear in the venue
Cheap = Bad 
Example 1: Hall5
DHCP request dispatched from Hall 5
South-West
Note:
• The request is immediately repeated
on the port by the SCEC switch a
few ten thousandths of a second
later. There should be only one
request every few seconds.
• The next slide shows what was
received in G01.
Example 1: G01
DHCP request received from Hall 5
South-West after SCEC core switch
traversal
Note:
• The DHCP transaction IDs match
the previous slide so this is the
same request.
• The data that leaves the SCEC edge
does not match what was sent!
There are many times more packets
received in G01!
• In some cases there are 12 packets
received in G01 when only one was
sent by the client at the given time!
Example 2: Coalescing and delay of
DHCP requests
Note DHCP requests are
still duplicated in pairs
Initial request.
Second request made
five seconds later
Third request made after
eight seconds (due to
DHCP back-off + slight
randomisation as per the
RFC)
Example 2: Coalescing and delay of
DHCP requests
G01 receives multiple
requests a few 10000ths of
a second apart.
Turn off DHCP Snooping on SCEC
Core
Correct behaviour: Nonduplicate DHCP Request /
ACK pair
Correct behaviour: Nonduplicate DHCP Request /
ACK pair
Correct behaviour: Nonduplicate DHCP Request /
ACK pair
Correct behaviour: Nonduplicate DHCP Request /
ACK pair
2009/2010 – GCCEC
Cisco WLC 4404 of DOOM
Extensive Rectification
Nearly killed me
Described in detail at:
http://www.msteched.com/2010/Australia/VOC208
http://www.techedbackstage.net/tag/wireless/
Logical Overview
OTW
TID
ADVA
3750 48T
OTW Customer Premise Equipment
2GBPS LACP TRUNK
3550 12 G
1GBPS
Telstra Customer Premise Equipment
2970
3550 12 G
3550 12 G
3550 12 G
3550 12 G
IDF (there are 13 of these)
1GBPS
Network Overview
500mbps Private
Layer 2 Service
to Pipe Networks
DC 2, Creek Street
Telstra Internet Direct
1gbps Layer 2 Service
500mbps IPv4 Transit
Cisco Router
Cisco Router
Public Address Space Network Segment
rras1
rras2
rras3
IPv4
Public Address Space Network Segment
REFER TO BEN
PARKER’S CONTENT
IPv4 & IPv6
2811
IPv6
microsoftevent.localdomain Private Nework
Cisco 5508
Wireless LAN
Controller
50 x Cisco 1252AGN
wifi Access Points
DNS Resolver
(Hyper-V Guest)
DHCP Server
\\services Print Spooler
(Hyper-V Guest)
and File Server
(Hyper-V Guest)
DNS Resolver
(Hyper-V Guest)
microsoftevent.localdomain
Exhibitors
Untrusted
rras5
(Physical Server)
IPv4 & IPv6
demonet.localdomain Private Nework
100BaseTX Wired Ports for:
* CommNet
* Recharge Bars
DHCP Server
(Hyper-V Guest)
Delegates
Over The Wire
100mbps IP Transit
IPv4 & IPv6 Transit
100BaseTX Wired port for
each breakout room.
show.localdomain Private Nework
\\services Print Spooler
and File Server 100BaseTX Wired port for
each breakout room.
(Hyper-V Guest)
DemoNet
Hyper-V Host
Servers
Also provides:
* DHCP
* DNS
So these services are
AD-integrated
demonet.localdomain
Speakers
Showcase
Somewhat
Trusted
DHCP Server
(Hyper-V Guest)
DNS Resolver
(Hyper-V Guest)
DHCP Server
(Hyper-V Guest)
DNS Resolver
(Hyper-V Guest)
show.localdomain
Speakers
Trusted
IPv4 & IPv6
Why?
IPv4 & IPv6
hmmm
1. Turn multicast on to
enable ipv6 RA
2. Ignore random ipv4
option that would lead you
to believe this setting does
not affect v6
3. Enjoy the loss of failover if the WLC dies
because you are
enabling ipv6’
POC
poc lab
100% Windows routing.
statefull & stateless config
RA disabled even though enabled through gui…
netsh interface ipv6 set interface <int> advertise=enabled
netsh interface ipv6 set interface <int> advertisedefaultroute=enabled
ipnat.sys old
the event
/48 assigned from apnic
2001:dfb::/48
/64 network segments for
delegate/production/management
the event
Cisco 2811’s replaced 2008r2 servers 2 hours before go live
Cisco Wireless LAN Controller blocks multicast by default
High end virtualised environment directly connected via ipv6 hosting over 120
virtual machines for demos.
A flat network with AD controllers live to the internet – your average MS sysadmin
gets scared..
IPv4 regarded as legacy.
end result
traffic
IPv4 Traffic:
2TB
Highly mixed
IPv6 Traffic:
35GB
http: youtube/google/facebook
smb: misconfigured windows machines
CDN’s are still on v4….
World’s Smallest Violin
Vendors and Vendon’ts
•
Two Words
•
delete startup-config
The Jiggle Test
120+ hour work weeks (here’s a hint: never work out your
hourly rate)
DemoNET
The numbers
24 x HP BL460c Blades (4 Enclosures, 2 Racks):
• 8 x Highly Available Hyper-V Clusters (16 Servers)
• 1 x Highly Available Hyper-V SP1 Beta Cluster (2 Servers)
• 4 x Standalone Hyper-V
• 2 x Windows 7
Total 119 VMs:
• 35 Showcase VMs
• 72 VMs (36 Sessions)
DemoNET
The layout
DemoNET
The network (IPv6 is King)
IPv6:
• The world is accessible!
• Public (Route) address space
IPv4:
• Legacy network
• Public (Route) and Private (NAT) address space
DemoNET
The network – pt2
DemoNET
Logistics
SYD/SIN/TPE > BNE
• Over The Wire
• Environment build (~30 days effort, 10 calendar days)
• Showcase and Speaker VM (imports)
BNE > GCCEC
• Showcase prep
• Go live
Question and
Answer
Session Title
Question and Answer Time
Related Content
Related Content
http://www.techedbackstage.net/
http://www.msteched.com/2010/Australia/VOC208
Thanks For Listening!
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